Spectrum-controls 1734sc-IE2CH Uživatelský manuál stáhnout pdf (Strana 45)

Chapter 4: IExCH and HART 4-5

User’s Manual Pub. 0300257-01 Rev. A

3. Every 2 minutes if bit remains set.

The following table describes the class, service code and instances required to send the

Read Additional Device Status message.

Table 4-1 (Read Additional Device Status)

Unconnected Message

Field Value Definition

Message Type “CIP Generic”

Service Code 0x4C Read Additional Status

Class Name 0x035D HART Object

Instance 0

1-4

Selects All Channels

Selects channel 0-3

Object

Attribute

None, leave this field blank

Request Size 0 No Request Data

Reply Size 2-112 bytes

(2) Size when information not available

(Instance 1-4)

(28) Up to this Size when valid

Information returned for a single

channel (Instance 1-4)

(56 if IE2CH) Fixed size returned for Instance

(112 if IE4CH) Fixed size returned for Instance

Number of Data bytes

returned

The following tables describe the possible message responses.

Table 4-2 (Request Data)

HART Read Extended Status - Request packet structure

Offset Field Value Definition

No Request Data

Table 4-3 (Request Failed)

HART Read Additional Status - Reply packet structure

Offset Field Value Definition

0 Status 34 = DR_RUNNING

(No Device or

connection process

not completed or re-

gathering device

info is in progress)

35 = DR_DEAD

(Channel is not HART

enabled)

Command status

1 Pad 0 Pad byte

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 83 84

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